Muffler



June 18, 1940. zmsrrz 2,205,024

MUFFLER Filed Sept. 20, 1938 Fig.1 /4 12 7f 1 4 I I I 1 a f I LG'III'IIIIIIIIIIIIIIIII.

Patented June 18, 1940 UNITED STATES PATENT OFFICE 3 Claims.

This invention relates to an improved muiller more particularly intended for use with internal combustion engines, and seeks, among other ob- .jects, to provide a device of this character which will be operative for greatly reducing back pressure in an exhaust pipe with the result that the efliciency and economy of operation of the englue is greatly improved.

Another object of the invention is to provide a 10 muiller which is simple in construction and which may be manufactured cheaply.

Another object of the invention is to provide a muiiler which will be effective for preventing blocking oi. the muiiier inlet pipe with motor waste.

A further object of the invention is to provide a muiiier which, in view of the fact that back pressure will be greatly reduced by the use thereof, will permit highly efficient emission of exhaust gases, quick starting of the engine, maximum fuel efliciency, and reduction of carbon in the engine cylinders and exhaust manifold strucure.

Other objects of the invention will become ap- 25 parent during the course of the following description.

The invention is illustrated in the accompanying drawing, wherein:

Figure l is a longitudinal sectional view of my an improved mufller.

Figure 2 is a vertical sectional view on the line 2-2 of Figure 3.

Figure 3 is a vertical transverse sectional view on the line 3-3 of Figure l.

35 Figure 4 is a vertical sectional view on the line H of Figure 1.

Referring now to the drawing, wherein, as will be seen, similar numerals of reference are employed to designate like parts throughout the various views, the numeral I indicates in general, the body of my improved mufller. The body is formed preferably from a pair of mating sections 2 and 3 which are pressed from single sheets of suitable metal and have their inner circumferential edges welded, as shown at 4, to define a unitary muiiler body. As best seen in Figure 3 of the drawing, the body I is formed with a circular wall 5 and substantially fiat end walls 2 and I.

In order to attach my improved muiiier to an 50 internal combustion engine exhaust pipe, such as shown at 8, I provide an'inlet pipe 9 which extends through the wall I into the interior of the muiiier body I. The inlet pipe 9 is located at one side of the muffler body and is welded at III in to the wall I. As best seen in Figure 1 of the drawing, the inlet pipe is formed with an obliquely cut inner end I I which defines a deflector I2 having a sharp end portion II which is extended partially through the wall 6 of the body and is welded thereon, as shown at II. It will now be 5 understood that the inlet pipe will be firmly secured in the body I of the mufiler. Near the inner end of the inlet pipe 9, a depression is formed defining a stop I5 for limiting inward movement of the free end of the exhaust pipe 8. As shown, 10 the exhaust pipe is surrounded by the inlet pipe 9 and, in order to retain the device in operative position on the exhaust pipe, the inlet pipe is split at I6 and a clamp II, of the split collar type, surrounds the split portion I6 of the inlet pipe. The clamp I1 has bolts III which are tightened about the inlet pipe for retaining the mufller in operative position on the exhaust pipe. Loosening of the bolts I8 may be efl'ected, of course, for permitting removal 01' the muilier from the pipe. 0

In order to permit emission of exhaust gases from the interior of the mufiler body I, I provide an outlet pipe I9 which is relatively small with respect to the inlet pipe 9 and is disposed with its axis in the same horizontal plane with the axis of said inlet pipe 9. Both of the pipes 9 and I9 are located in the upper portion of the body so that an area 20 is provided throughout the lower half of the body for receiving circulating exhaust gases. The outlet pipe III, as best seen in Figure 2, extends through the wall 6 of the body I and is secured therein by means of a weld 2I. The inner end portion of the outlet pipe is oblique in formation, as shown at 22, to define a deflector 22 which terminates in a sharpened end portion 24. The end portion 24 extends partially through the wall I and is welded thereto, as shown at 25. A rigid mounting for the outlet pipe in the body is, therefore, provided. It should be understood that it is not absolutely necessary to provide a cut away portion for the outlet pipe, as the weld 2i will firmly mount said pipe in the body. The weld 2! and portion 24, however, impart greater rigidity to the structure. The outer end portion of the outlet pipe 23 is 5 undercut obliquely at 26 so that the exhaust gases'escaping through the outlet pipe will tend to be deflected downwardly.

As will be observed by referring to Figure 1 of the drawing, the inner end portion of the outlet pipe I9 extends past the plane of the outer end of the inlet pipe 8 so that effective distribution of gases within the muiiler will be insured and direct flow of the gases from the inlet pipe to the outlet pipe prevented. 56

It is thought that the construction of my improved mufiler will now be understood. It is desired to call attention to the fact that actual tests have shown my improved muffler to be far superior in operation to other muillers heretofore placed in use. As heretofore stated, the use of my improved mufller improves the operation of an internal combustion engine for the reason that back pressure through the exhaust pipe and back into the exhaust manifold is largely eliminated. The results of the elimination of back pressure are greater efficiency from a given amount of fuel, also, carbon in the motor will be decreased, and the exhaust gases will be freed rapidly.

It is further desired to emphasize that the use of my improved muilier will be effeetivefor eliminating the blocking of the muiiler inlet pipe with motor waste. This will eliminate the trouble and expense of cleaning the muffler inlet pipe, a job for which a consistent charge is usually made when performed by automobile mechanics.

My improved muiller is simple in construction and cheap to manufacture. It is thought that further description is unnecessary.

Having thus described the invention, what I claim is:

1. In a muflier, a body, an inlet pipe carried by the body and having its inner end portion cut downwardly and rearwardly on an incline to define a deflector, the outer end of said inlet pipe being split, a clamp surrounding the split portion of the inlet pipe, said inlet pipe being adapted to surround an exhaust pipe and said clamp securing said inlet pipe in operative position on said exhaust pipe, a stop on the inlet pipe for limiting inward movement of the exhaust pipe,

means retaining the inlet pipe within the body, an outlet pipe carried by the body, and means securing the outlet pipe in operative position on the body, said body receiving exhaust gases from the exhaust pipe through the inlet pipe for circulation in said body and exhaust through the outlet pipe with a minimum of back pressure in the exhaust pipe.

2. In a muffler, a body having end walls, an inlet pipe extending into the body through one of said end walls and having a cut away inner end defining a deflector and a sharpened end portion for said deflector, said sharpened end portion extending through the opposite end wall of the 'body, means securing said sharpened portion in said end wall, said walls rigidly mounting the inlet pipe on the body, and an outlet pipe having its axis disposed in the same horizontal plane with the axis of the inlet pipe and extending through one of the walls of the body, means securing the outlet pipe on said wall, said outlet pipe having a cut away inner end defining a sharpened end portion secured in the other wall of the body, said body receiving exhaust gases from the exhaust pipe in the inlet pipe and circulating said gases within the body to flow to the atmosphere through the outlet pipe, said defleetor for the inlet pipe deflecting the gases downwardly within the body and reducing back pressure of the exhaust gases within the exhaust P pe.

3. In a mufller as claimed in claim 2, wherein the outlet pipe is relatively small with respect to the inlet pipe for slightly restricting the outflow of exhaust gases and assuring complete muflling of motor noise.

MATTHEW G. ZINSITZ.

iii) 

